The average computer user might think that the number of languages their operating system supports is pretty long. OSX supports 22 languages, and Microsoft claims to support 96, but they're counting different regional dialects multiple times. But there are over 6000 languages, and though many of them are spoken by a dwindling few, there are some languages that are spoken by millions of people that are supported very poorly, if at all, by computer operating systems. The reason for the support being poor is that the people who speak those languages are poor, and are not good "markets." It's only because of the efforts of a few dedicated people that computing support for languages such as Burmese, Sinhalese, Pali, Cambodian, and Lao have been as good as they are, but the trends for the future are not good.

In any case, I'm sure there are many fantastic reasons to keep around all of the thousands of languages that were spawned because of the inability of people to cover meaningful geographic distances quickly, but there are probably more reasons supporting people being able to understand each other instead.

For "analogy" (I kid...), if you post in some Khmer dialect here, you're unlikely to get many responses. It's not only not much of a market for OS vendors, it's limiting in terms of your own economic opportunities. So it goes.